Why is fat substitute Olestra lower in calories than traditional fats like butter?

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BlackTom AI · Accepted Answer

When evaluating why Olestra is lower in calories than traditional fats, it's important to consider how the body handles the molecule.
Option 1: 'Olestra is made with only saturated fatty acids.' This is inaccurate as the key reason for the calorie difference is not the degree of saturation but indigestibility; Olestra is a synthetic fat that mimics triglycerides but is not metabolized by human lipases, regardless of saturation.
Option 2: 'The synthetic fat molecules are indigestible by human enzymes.' This statement correctly identifies the central mechanism: Olestra is designed with sugar alcohols and fatty acids (often sucrose esters) that human digestive enzymes cannot efficiently break down, so the fat calories are not absorbed.
Option 3: 'This is false. Olestra actually is higher in calories than traditional fat.' This is incorrect; extensive nutrition literature shows Olestra provides zero or negligible usable calories because it passes through the digestive system unmetabolized.
Option 4: 'Olestra allows the body to convert fat molecules directly to glucose instead of being stored as muscle.' This is a misconception. The body does not convert fat to glucose efficiently in humans, and Olestra’s lower calories are not due to any glucose formation pathway; it simply isn’t digested and absorbed as fat.
In summary, the defining feature is the indigestibility of Olestra by human digestive enzymes, which prevents absorption of fat calories, while the other options misstate chemical properties or metabolic outcomes.

fshn_120_120251_244864 CHAPTER 6 DEFINITION INQUISITION (DI) - 3 TAKES - HIGHEST SCORE COUNTS

Why is fat substitute Olestra lower in calories than traditional fats like butter?

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